Access Control Service Tutorial

Hi Everyone,

I am having a hard time working with ACS, I tried to implement the tutorial given in LAB-6 under appendix-A in the Developer Boot Camp guide for Several Times now but its not working. it does not show data for the both users and give white label Error.

What i want do is to create two users, one may have access to one asset data and the other may have access to another asset then i would like to go further than this, where one user can access some feature of an asset and other user can access some other features of the same asset.

So can anyone can suggest a comprehensive and complete tutorial regarding this ?